KYB 344366 Shock Absorber - Rear

KYB Excel-G Rear Shock Absorber

The KYB Excel-G 344366 is a rear suspension shock absorber built to restore original ride control on heavy-duty GM vans and trucks. It is an OE-style replacement for applications such as Chevrolet P30, Chevrolet C20/C30, GMC P3500, and related rear-position fitments.

KYB Excel-G is the brand’s OEA line, meaning it is built on the same assembly lines and with the same OE-quality components used for original equipment applications. For drivers and technicians looking to return a vehicle to factory-like handling, the 344366 focuses on control, stability, and consistent damping rather than changing the suspension feel.

Key Features

• KYB recommended OEM replacement shock for rear suspension service
• Nitrogen gas-charged, twin-tube design for consistent damping response
• Triple-lip fluid seal helps reduce oil and gas leakage
• Vehicle-specific, hand-assembled damping valves manage tire contact, steering response, and body movement
• Strong strut body and bracket construction helps minimize flex and maintain alignment
• Dust cover included
• Part number 344366 for easy identification and ordering

Product Details

The Excel-G line is engineered to restore the vehicle’s designed ride control, lane-change response, braking stability, and handling balance. On full-size GM truck and van platforms, that means more predictable rear suspension behavior under load, during cornering, and over uneven pavement. This part cross-references Monroe Shocks & Struts 34960 and Gabriel G63366 for the same application.

Compatible With rear applications including 1975-1999 Chevrolet P30, 1975-1986 Chevrolet C20 and C30, 1982-1989 Chevrolet P20, 1987-1988 Chevrolet R20 and R30, 1993-1996 Chevrolet G30, 1979-1999 GMC P3500, 1979-1986 GMC C2500 and C3500, 1979-1980 GMC P1500, 1987-1989 GMC R2500, 1987-1991 Chevrolet R3500, 1987-1991 GMC R3500, and 1993-1996 GMC G3500. The 344366 is a rear shock absorber for these GM chassis applications, including heavy-duty chassis listings where noted.

Common Issues This Shock Can Address

• Excessive rear bounce after bumps or dips
• Loose or unstable handling during lane changes
• Reduced braking stability from worn rear damping
• Uneven tire contact caused by weak shock control
• Body movement that feels uncontrolled on heavy-duty GM chassis

Installation Notes and Tips

Verify rear-position fitment against the vehicle’s chassis notes before installation, especially for P30 and G30 applications with motorhome or heavy-duty chassis exceptions. Some listed applications require replacement of the suspension strut and coil spring assembly according to the manufacturer’s instructions. Confirm compressed length, extended length, and mount type before installation: compressed length 13.98 in., extended length 23.43 in., stroke length 9.45 in., with E2(14.6x41) upper and lower mounts.

Quality Assurance

KYB supplies shocks and struts to new vehicle manufacturers, and Excel-G is produced on the same OE assembly lines using OE-quality components. The result is an OEA-style replacement focused on restoring original suspension performance for Chevrolet and GMC rear applications.